Larger tank on 2013 model?

[Django]

Didier, I thought several members had mounted the EX tanks, bought from Samurider of Japan, on their bikes. Maybe I am mistaken. I'm sure they will chime in and let us know. Did Honda France say why they thought the tank would not fit? I know several members have put 14 seats and side covers on their 13s

I don't recall anyone on here mounting a '14 DLX tank on a '13 model (of course I could be wrong).

I think KennyB may have hit on the issue in his post above. The '14 DLX uses a different fuel pump and as I recall, the fuel pressure requirement for the DLX was substantially higher than the '13 model. It doesn't look like a '13 fuel pump would mount directly to the DLX tank and the question would be, what would happen if you used the higher pressure DLX pump on a '13 fuel system? I'm pretty much a carb guy when it comes to fuel systems, so I wouldn't venture a guess as to whether or not it would make a difference, but it sounds like an expensive experiment

I don't recall anyone on here mounting a '14 DLX tank on a '13 model (of course I could be wrong).

I think KennyB may have hit on the issue in his post above. The '14 DLX uses a different fuel pump and as I recall, the fuel pressure requirement for the DLX was substantially higher than the '13 model. It doesn't look like a '13 fuel pump would mount directly to the DLX tank and the question would be, what would happen if you used the higher pressure DLX pump on a '13 fuel system? I'm pretty much a carb guy when it comes to fuel systems, so I wouldn't venture a guess as to whether or not it would make a difference, but it sounds like an expensive experiment
I understood the 13 and 14 dlx to have the same engine (same displacement, same horsepower, etc). Why would one need "substantially" higher fuel pressure?

They have the same engine, but Honda changed the fuel system on the DLX/EX for some reason. That was one of the quirks noticed when the shop manual was published this year. The DLX also requires different amounts of fluid for each front fork, while the STD model uses the same in each. I don't think anyone has figured out the reason for that one either.

Just for refill (different hold back of old oil) or also for first fill?

I know this already from my BMW K1100. There is pull damping cartridge on one side, push damping on the other side. They have a different hold back of oil, when you drain it for oil change.